Riverine warfare in the Mekong Delta region of Vietnam. U.S. Riverine Afloat Force consisting of one Brigade of the Army's Ninth Division, and the U.S. Navy's River Flotilla One, supported by special Navy ships. Seen are: Barracks ship; Armored and armed transport ship, with river vessels alongside and helicopter landing on deck. An armor-plated and armed 60-foot "Monitor" river craft underway and firing from its gun turret. U.S. soldiers firing a howitzer on board a barge. An F-100 Supersabre tactical jet fighter flies over river and drops ordnance on riverbank. American troops make amphibious assault on riverbank.